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(a) 5.8g of a non-volatile solute was di...

 (a) 5.8g of a non-volatile solute was dissolved in 100g of carbon disulphide (Molar mass = 76). The vapour pressure of the solution was found to be 190 mm Hg. Calculate the molecular mass of the solute. The vapour pressure of pure carbon disulphide 195 mm Hg. 
(b) What are azeotropes? Give an example.

Text Solution

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(A) ` (P^(@)-P)/(P^(@))= w.M/mW,` `(195-190)/(195)`= `(5.8xx76)/ (mxx100)`
`m=(5.8xx76xx195)(100xx5)=171.09 g mol e^(-1)`.
(b) A solution which distills over without change in composition e.g 95.6% ethonal +4.4% water (OR)
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